Piston Selection

Check 

• 1.
  
  
  NOTE: The cylinder bore must be within the specifications for taper and out-of-round before fitting a piston.
  • Measure the cylinder bore in 2 directions.
  • Select a piston size based on the cylinder bore.

Courtesy of FORD MOTOR COMPANY

• 2.
  
  
  NOTE: For precision fit, new pistons are divided into 3 categories within each size range based on their relative position within the range. A paint spot or specific size grade on a new piston indicates the position within the size range.

  Choose the piston with the correct paint color or specific size grade.